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But yet atheists continue to “beat the dead horse” claiming that the Bible is NOT true and there is NO God and cite these outdated laws as a source of reference. Why?

The objection that atheists most frequently raise in regard to the OT has little to do with trying to prove that there's no god. More often it is countering Christian claims of moral superiority and moral absolutism, despite the obvious hypocrisy of ignoring the inconvenient bits of their own Holy book's teaching, and claiming that some of those moral absolutes don't apply anymore.